bug#13776: 24.3.50; Some items on the mode-line don't have a suitable tooltip

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Mon, 06 Sep 2021 12:37:02 +0200
> Cc: Glenn Morris <rgm@gnu.org>, 13776@debbugs.gnu.org
> 
> Xue Fuqiao <xfq.free@gmail.com> writes:
> 
> > I think that "Info file" and "Process status" should be used at least,
> > because there should be some introductory text, just like the
> > `display-time-mode'.
> 
> I've now added these short tooltips to those bits of the mode line in
> Emacs 28.

For Info, the tooltip now says "Info file name", but that's
inaccurate, because we show "elisp" when the file name is
"elisp.info", and when the file is "FOO.info.gz" we show "FOO.info"
(which is inconsistent, and is probably an unrelated bug).

Btw, why isn't there a similar explanation in the tooltip for the node
name?